M97 and M108 in Ursa Major, taken with Astro-Physics 5 inch (130mm) refractor with AP Reducer for f/4.5, with Canon 5D MkII camera for stack of 6 x 8 minute exposures at ISO 800. Slight haze added glows.
Taken April 26, 2006 with 5-inch apo refractor at f/4.5 and Canon 20Da camera at ISO400. Four 10-minute exposures average-stacked.
The Owl Nebula, Messier 97, a planetary nebula in our galaxy, and the edge-on spiral galaxy Messier 108, paired in the same area of sky below the Bowl of the Big Dipper in Ursa Major. This is a stack of 5 x 4-minute exposures at ISO 1600 with the Nikon Z6 mirrorless camera taken as part of testing, on January 14/15, 2019. This was through the Astro-Physics Traveler refractor at f/6 with the Hotech field flattener. No LENR or dark frames applied but it was about -10° C. Flat fielding supplied by lens correction in Camera Raw and by Gradient Xterminator filter in Photoshop.
